ALSA: mixart: fix a comment typo

Fix a comment typo in mixart.h.
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/mixart/mixart.h

@@ -86,7 +86,7 @@ struct mixart_mgr {
 	u32 msg_fifo[MSG_FIFO_SIZE];
 	int msg_fifo_readptr;
 	int msg_fifo_writeptr;
-	atomic_t msg_processed;       /* number of messages to be processed in takslet */
+	atomic_t msg_processed;       /* number of messages to be processed in tasklet */
 
 	struct mutex lock;              /* interrupt lock */
 	struct mutex msg_lock;		/* mailbox lock */